Method of preparing alloys



Patented July 17, I934 PATENT OFFICE METHOD OF PREPARING ALLOYS Pierre Berthlemy, Henry de Montby and Marie Pouvreau, Paris, France, Socit Anonyme Francaise dite: Socit des r j Brevets Berthelemy de Montby, Paris, France o M I No Drawing. Application October 15, 1930, Serial No. 488,988. In France October 29,

Jean- II to cember 13, 1927) have shown that it is possible 2 Claims.

to incorporate homogeneously a rather considerable quantity of cadmium into aluminium and aluminium alloys, by using magnesium as a vehicle for cadmium. Whereas previously it was 1 never possible to incorporate cadmium homogeother metals than cadmium that so far could.

neously into aluminium and aluminium alloys, experience has shown that such incorporation can be obtained with absolute certainty by the abovementioned procedure.

Continuing their researches, Messrs. Berthlmy, de Montby and Pouvreau have now found that this procedure can also be extended and lead in the alloy, in theform of a solid solution.

The alloy thus prepared is of a perfect homogeneity. The homogeneous distribution of lead may be explained by the fact that the magnesium-lead diagram of equilibrium shows a limited solid solution of lead in. magnesium.

Such an 'alloy behaves very wellj hemsub would make it possible to incorporate homogejected to thj ilafieus-agentsfiffiatflral neously into aluminium and aluminium alloys siorfidampness, salt water, salt spray etc.)

only be heterogeneously incorporated. They have also found that the application of this general method would make it possible to obtain alloys possessing special physical or chemical characneously into aluminium and aluminium alloys, by using magnesium as a vehicle for the metal to be thus incorporated, such metals having been only heterogeneously incorporated in the past.

Another object of the invention is the new industrial product formed by an aluminium alby containing a metal (lead) capable of con- 5.- ferring special properties upon the alloy thus Alternate corrosion trials made with sea water with an addition of 10% of hydrogen peroxide of 20 volumes strength have given the following results:

Loss of weight per ltesistancen 24-26 kgs. per mm Apparent elasticity limit 20-22 kgs. per mm produced, said additional metal being incorpoi 25 rated homogeneously into the alloy by the use gamm of magnesium as a vehicle. Brine hardness 65 Generally speaking, the alloys thus obtained (rolling, forging, stretching, upsetting, drawing etc.) or can be molded.

As an example of how the invention may be car-' ried out procedure for preparing a lead-containing aluminium alloy is here described as follows The aluminium is melted in a plumbago cruciwhen the magnesium-lead alloy is completely of being applied also to aluminium alloys containing other ingredients thanlead. I

An alloy of the following composition may be prepared:

25 teristies. square meter An object of the invention is the general ggg z gg ala um method f inco ratin other metals home a mi i 0 mo 8 g Al-Si at 13% Si alloy 5,5

ble with magnesium. The molten bath is Copper 3,50 cleaned 'in the usual way and a magnesium- Manganese 0,30 lead alloy is then incorporated. Magnesium 0,90

50 The quantity of magnesium thus added should Si 0,40 be from 0,80 to 1% of the total amount of alu- Iron 0,30 minium; the quantity of pure lead to be added Lea 1,95 should .be from 1.50 to 2% of the total amount Aluminium 92,65 of aluminium.- no

This alloy shows the following characteristics when rolled after thermal treatment: resistance elasticity 23; elongation 12-13%.

Losses in weight per square meter on comparative trials of this alloy and of a high resistance Al-Cu-Mg-Si alloy were as follows:

Lead alloy 1 Al-Cu-Mg-Si alloy 2 In the claims that follow, the term solutions" is used generically to cover solid solutions, solid compounds and mixtures of the former and the latter. a

What we claim is:

1. A method of forming a homogeneous alloy of aluminum and lead, in which the major portion of the alloy is composed of aluminum and the lead is homogeneously distributed in the PIERRE BERTHELEMY, HENRY na MONTBY. JEAN-MARIE POUVREAU.

not 

